Paper cup



Mar. 13, 1923.

G. J. BOHLMAN PAPER CUP Filed Feb. 5, 1917 PM m m Patented Mar. 13,1923,

UNITE PATENT OFFICE.

GEORGE J. EonLmAfiQoE'M nEonn, MASSACHUSETTS, AssIeNoE To AMERICAN WATERSUPPLY 00. on NEW NGLAND, o1" BOSTON, MASSACHUSETTS, A con- PORATION orNEWuYOBK.

PAPER. our.

Application filed February 5, 1917. Serial 110. 146,609.

To all whom it may concem:

Be it known that I,

water-repellent, adapting it to hold water" for a reasonable length oftime, has a long fiber, and is heavily calendered, adapting it for alimited distortionwithout breaking, whereby its edge-portion may berolled so that a resilient rolled edge may be provided withoutpermanently altering its inherent qualities. The receptacle has a bottomclosure and sealing-means for said closure.

whereby the joint between the closure and body is sealed and the closuresecurely held in place, said sealing-means being local and covering onlya restricted area and limited to the lower end-portion of the body, sothat the cup will not be disfigured inan objectionable manner, nor willthe inherent char acteristics of the paper composing the body bemodified.

A drinking cup having a body composed of paper having the inherentcharacteristics or qualities above stated has many advantages over a cuphaving its body saturated or coated with paraffin, it being sufficientlywater-repellent for all practical purposes, but serious difliculty isencountered in providing such a body with a bottom closure, which willbe securely held in place and the joint between the bottom closure andthe body will be water-tight, and herein the sealed bottom closuresolves the problem.

The sealing-means serves not only to render the joint water-tight, butalso to hold thebottom closure from falling out. The sealing-meanspreferably employed is a waterproof substance, such as aparaflin wax;and it is applied externally to the bottom closure in liquefiedcondition, and its application is in a very limited predeterminedquantity, after which it is immediately permitted or caused to. solidifyso that the cup body will not absorb any appreciable amount, the lowerend-portion of the body,

GEoncEJ. BoHLMAN, a citizen of the United States, residing at' whichsurrounds the bottom'closure, only being eifected, so that said body isnot obectionably' disfigured.

Therefore, another quality of the paper composing'tli'e cupbody, whichis preferably employed, is its capability of absorbing the material ofthe sealing-means. D Fig. 1 is a side elevation of a paper drinklug-cup,embodying this invention.

Fig. 2 is a longitudinal vertical section of the same.

Fig.3 is an enlarged to be referred to.

1 represents the tubular body, here shown as frustro-conical, which iscomposed of a fragmentary detail piece of paper bent into tubular formand I having its side edges overlapped and secured together.

The paper composing said body, as before stated, has certain inherentcharacteristics or qualities, that is to say, it contains a suitablesizing or stifl'ening material, has a long fiber, and is heavilycalendered so that it is water-repellent, and is capable of a limitedamount of distortion without breaking so that its edge may berolled,.without alterationof its permanent inherent characteristics orqualities. Abody composed of paper having such inherent qualities orcharacteristics is well suited for drinking cups, as contrasted with awaterproof or coated paper, for the reason that it is cheaper and moreeconomical to use, when all costs of labor and materialare taken intoconsideration; is less liable to stick to an adjacent cup when the cupsare nested, particularly in the summer time, and its general appearanceis moreacceptable on account of its being much whiter orsemi-transparent. The upper edge of the body is or may be formed with aroll 5,.WhiCl'I'iS extended outward and continued for nearly a completecircle, and said roll,

together with the body, is more or less re- A bottom closure is providedfor the cup which, as here shown, consists of adisk 10,.

having its margin cut to form interdental,

spaces 12, at regular intervals, or it may be slitted radially inwardfor a short distance,

thereby to form a series of marginal pro-- jections 15, and saidprojections are adapted to be turned downwardly and arrangedforengagement with the interior of the wall of lower end will be closed andthe closure will be additionally held by the engagement of theprojections with the body. Usually these projections terminate flush orsubstantially so with the-lower edge of the body, as

' shown in Fig. ,2. Said closure is additions ally held in place, andthe joint between the closure and the body is tightly closed or sealedby suitable sealing-means 20,- here shown .as composed "of a waterproofsubstance, such for instance as parafiin wax, or it may be awater-repellent substance, which is applied locally thereto when inliquefied condition. The heated wax is usually applied externally to theinverted cup, and the material so applied is allowed to spread over theentire surface of the closure to and including the edges thereof, and tofill, more or less, the interdental spaces between the projections orslits, and to be absorbed by said projections and by the lower end-por-.tion of the body, so that when the wax congeals, a liquid-tightjoint'will be produced and the closure will be secured in place. Alimited but predetermined amount of paraflin wax is applied, and care istaken to apply only the necessary amount, otherwise a surplus will bepresent which will be absorbed by the body and will tend to disfiguresaid body in an objectionable manner. The limited quantity is regulatedwith this end in view. As a result, the lower end-portion ofthe bodyonly, which includes the closure,

' is effected.

1. As a new article of manufacture, a frustro-conical drinking cupcomposed of paper having an inherently partially water proof body notcoated on its outside and Lee-seas being free from indentations andprojections on its inside and a water proof bottom closure.

2. As a new article of manufacture, a

drinking cup consisting of a frustro-conical body of paper characterizedby being inherently temporarily waterproof, not-coated on its outsideand being free from indentations and projections on its inside, saidbody having a rolled edge at the top, and a waterproof bottom closurefor said body comprising acircular paper disc having a downwardlytoothed flange arranged at the lower end of and to close said body, andmeans comprising paraffin uniting said closure and body and sealing thejoint between them characterized by permeating said bottom closure andsaid body adjacent the closure, and filling the joint between them andlimited in its permeation of the body to that portion of the bodyimmediately adjacent to the bottom closure. I

3. A drinking cup comprising an annular body .portion of inherentlypartially waterproof paper, not coated on its outside and being freefrom. indentations and projections on its inside, a circular bottomclosure having an annular 4 toothed flange extending downwardly to thebottom of'the body portion, and means for uniting and sealing said bodyand closure and rendering the latter waterproof comprising paraiiinapplied to the bottom'closure and to the body portion internally thereofand. below the bottom closure.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

' GEORGE J. BOHLMAN.

Witnesses:

AMos I1. TAYLoR, ELIZABETH M. IIANsoN.

